package com.example.yls.demoa;

import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity
        implements IOUpdateListener{
private TextView txttime;
private MyReceiver receiver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        receiver=new MyReceiver(MainActivity.this);
        IntentFilter filter=new IntentFilter();
        filter.addAction(Intent.ACTION_TIME_CHANGED);
        filter.addAction(Intent.ACTION_TIME_TICK);
        filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
        registerReceiver(receiver,filter);

        txttime = findViewById(R.id.txt_time);
        updateTime();
    }

    public void updateTime() {
        Calendar calendar = Calendar.getInstance();
        int hour =calendar.get(Calendar.HOUR);
        int min =calendar.get(Calendar.MINUTE);
        txttime.setText(hour+":"+min);
    }
    protected void onDestory(){
        unregisterReceiver(receiver);
        super.onDestroy();
    }
}
